This is definitely eye strain. It could be solely because of. Continuous computer work or you could have a refractive error (glass no.)
Next Steps
A general rule to follow is to blink consciously and avoid staring at the screen. Take a 20 Sec break every 20 mins of working on the laptop to look outside at something green.
Health Tips
Use lubricating eye drops intermittently
Get refraction (eye number) checked locally